Image display device

ABSTRACT

In the present invention, when one signal line group and another signal line group which differs from one signal line group in length are arranged adjacent to each other, a disconnection due to static electricity which is caused by a spark generated between a signal line of one signal line group and a signal line of another signal line group which are arranged adjacent to each other can be prevented. The image signal line is specifically configured such that, on a substrate, a first signal line group in which a plurality of first signal lines are arranged in parallel and a second signal line group in which a plurality of second signal lines are arranged in parallel in a region arranged adjacent to the first signal line group are formed and dummy lines are arranged between the first signal line group and the second signal line group.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to an image display device, andmore particularly to an image display device which is referred to as anactive matrix type image display device, for example.

[0003] 2. Description of the Related Art

[0004] For example, the active matrix type liquid crystal display deviceincludes, in the inside of a panel thereof, gate signal lines whichsupply scanning signals to a pixel group consisting of respective pixelswhich are arranged in parallel in one direction and drain signal lineswhich supply video signals to the respective pixels to which thescanning signals are supplied.

[0005] In each pixel, a switching element which is operated in responseto supplying of the scanning signal, a pixel electrode to which signalsfrom the drain signal lines are supplied through the switching element,and a counter electrode which generates an electric field forcontrolling optical transmissivity of liquid crystal between the pixelelectrode and the counter electrode are formed.

[0006] The supply of the scanning signals to the gate signal lines andthe supply of the video signals to the drain signal lines arerespectively performed by a scanning signal drive circuit and a videosignal drive circuit each of which is constituted of semiconductordevices which are mounted on a surface of one of substrates of a panelon which the gate signal lines and the drain signal lines are formed(hereinafter, these circuits being simply referred to as signal drivecircuits in some cases).

[0007] Here, each one of the scanning signal drive circuit and the videosignal drive circuit is constituted of a plurality of semiconductordevices. Further, the signal lines which are arranged adjacent to eachother are formed into a group and one semiconductor integrated device isallocated to each group.

[0008] In this case, the plurality of respective semiconductor deviceswhich constitute the video signal drive circuit, for example, areconfigured such that data are transmitted through a data transfer signalline between each semiconductor device and another neighboringsemiconductor device whereby the cumbersomeness of the constitutionwhich supplies signals independently to respective semiconductor devicesis obviated.

BRIEF SUMMARY OF THE INVENTION

[0009] First of all, inventors of the present invention have found out aphenomenon in which during a manufacturing process of the image displaydevice having such a constitution, a spark attributed to staticelectricity is generated between the data transfer signal line and thedrain signal line which is arranged adjacent to the data transfer signalline and these lines are disconnected.

[0010] When the inventors pursued a cause of this phenomenon, afollowing fact is found out. That is, during the manufacturing, thesubstrate repeats attraction and peeling-off thereof with respect to ametal-made fixing portion which supports the substrate so that staticelectricity of high voltage which is referred to as so-called peel-offcharge is applied to the whole substrate.

[0011] In this case, there lies large difference between an area forrespective data transfer signal lines which are formed as a group ofdata transfer signal lines and an area for respective drain signal lineswhich are formed as a group of drain signal lines, for example, adjacentto the group of data transfer signal lines. This is because that whilethe group of data transfer signal lines is formed in the periphery ofthe substrate, the group of drain signal lines extend traversing thepanel.

[0012] Accordingly, the large difference is generated between a chargequantity of static electricity which is charged to the group of datatransfer signal lines and a charge quantity of static electricity whichis charged to the group of drain signal lines and hence, a spark isliable to easily occur between the data transfer signal line and thedrain signal line which are arranged adjacent to each other.

[0013] Further, during the manufacturing process, when the data transfersignal lines are isolated every other line and the drain signal linestemporarily adopt the constitution in which the drain signal lines areconnected to each other using a common line, while the potential of thedrain signal lines rapidly approaches 0, the potential of the datatransfer signal lines is held at a high level.

[0014] Accordingly, a potential difference of high voltage is generatedbetween the data transfer signal lines and the drain signal lines andhence, a spark is liable to occur between the data transfer signal lineand the drain signal line which are arranged adjacent to each other.

[0015] The present invention has been made in view of such circumstancesand it is an object of the present invention to provide an image displaydevice which, when one group of signal lines and another group of signallines which differ in length from one group of signal lines are arrangedadjacent to each other, can prevent the disconnection attributed tostatic electricity generated by the occurrence of a spark between thesignal line of one group of signal lines and the signal line of anothergroup of signal lines which are arranged adjacent to each other.

[0016] To briefly explain the summary of typical inventions out of theinventions disclosed in this specification, they are as follows.

[0017] Means 1.

[0018] According to the image display device of the present invention,for example, a first signal line group constituted of a plurality offirst signal lines which are arranged in parallel and a second signalline group constituted of a plurality of second signal lines which arearranged in parallel in a region adjacent to the group of first signallines are formed on a substrate, and a dummy line is arranged betweenthe first signal line group and the second signal line group.

[0019] Means 2.

[0020] The image display device according to the present invention is,for example, on the premise of the constitution of means 1,characterized in that both ends of the dummy line are not connected toother signal lines.

[0021] Means 3.

[0022] The image display device according to the present invention is,for example, on the premise of the constitution of means 1,characterized in that the dummy line has each one portion thereofconnected to the first signal lines and the second signal lines whichare arranged adjacent to the dummy line.

[0023] Means 4.

[0024] The image display device according to the present invention is,for example, on the premise of the constitution of any one of means 1 to3, characterized in that the dummy lines is constituted of a pluralityof lines which are arranged in parallel.

[0025] Means 5.

[0026] The image display device according to the present invention is,for example, characterized in that a drive circuit which suppliessignals to respective pixels in an image display part of a substratethrough signal lines is formed outside the image display part, the drivecircuit is constituted of a plurality of semiconductor devices, theserespective semiconductor devices are configured such that data aresupplied between these respective semiconductor devices and othersemiconductor devices which are arranged adjacent to these respectivesemiconductor devices through data transfer signal lines, and a dummyline is formed between the signal lines and the data transfer signallines.

[0027] Means 6.

[0028] The image display device according to the present invention is,for example, on the premise of the constitution of means 5,characterized in that the signal lines are drain signal lines whichsupply video signals to respective pixels, and the drive circuitconstitutes a video signal drive circuit.

[0029] Means 7.

[0030] The image display device according to the present invention is,for example, on the premise of the constitution of means 5,characterized in that the signal lines are gate signal lines whichsupply scanning signals to respective pixels, and the drive circuitconstitutes a scanning signal drive circuit.

[0031] Means 8.

[0032] The image display device according to the present invention is,for example, on the premise of the constitution of means 5,characterized in that the signal lines which are arranged adjacent toeach other are formed into a group, the signal lines which are formedinto each group are directed in the converging direction outside theimage display part and are connected to the respective semiconductordevices, and data transfer signal lines which connect between thesemiconductor device and another semiconductor device arranged adjacentto the former semiconductor device are formed such that the datatransfer signal lines wrap around at the image display part side thanthese respective semiconductor devices.

[0033] Means 9.

[0034] The image display device according to the present invention is,for example, on the premise of the constitution of means 5,characterized in that the dummy line is connected with the signal lineswhich are arranged adjacent to the dummy lines.

[0035] Means 10.

[0036] The image display device according to the present invention is,for example, on the premise of the constitution of means 9,characterized in that the connection between the dummy lines and thesignal lines are established at the image display part side.

[0037] Means 11.

[0038] The image display device according to the present invention is,for example, characterized in that a pair of electrodes are formed oneach pixel within an image display part of a substrate, one of the pairof electrodes includes a counter electrode to which a counter voltagesupply signal which becomes the reference with respect to signalssupplied to another electrode of the pair of electrodes is supplied, adrive circuit which supplies signals to the respective pixels throughsignal lines is formed outside the pixel display part, the drive circuitis constituted of a plurality of semiconductor devices, a countervoltage supply signal line which supplies counter voltage supply signalsto the counter electrode is formed on a region between the semiconductordevice and another semiconductor device which is arranged adjacent tothe former semiconductor device, and a dummy line is arranged betweenthe signal lines and the counter voltage supply signal line.

[0039] The present invention is not limited to the above-mentionedconstitutions and various modifications are conceivable withoutdeparting from the scope of technical concept of the present invention.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0040]FIG. 1 is a plan view of an essential part showing one embodimentof an image display device according to the present invention and isalso a view corresponding to a portion of a frame A in FIG. 3;

[0041]FIG. 2 is a plan view showing one embodiment of the wholestructure of the image display device according to the presentinvention;

[0042]FIG. 3 is a plan view showing another embodiment of the wholestructure of the image display device according to the present inventionand is also a view obtained by simplifying FIG. 2;

[0043]FIG. 4 is a comparison view for showing an advantageous effect ofthe present invention;

[0044]FIG. 5 is a view showing a product to which the present inventionis applied and is also a plan view corresponding to FIG. 1;

[0045]FIG. 6 is a view showing a product to which the present inventionis not applied and is also a plan view corresponding to FIG. 4;

[0046]FIG. 7 is a plan view of an essential part showing one embodimentof the image display device according to the present invention;

[0047]FIG. 8 is a plan view of an essential part showing one embodimentof an image display device according to the present invention;

[0048]FIG. 9 is a plan view of an essential part showing one embodimentof the image display device according to the present invention;

[0049]FIG. 10 is a plan view of an essential part showing one embodimentof the image display device according to the present invention; and

[0050]FIG. 11 is a plan view of an essential part showing one embodimentof the image display device according to the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0051] Preferred embodiments of an image display device of the presentinvention are explained in conjunction with drawings. In the explanationmade hereinafter, the image display device is explained by taking aliquid crystal display device, for example, as an example.

[0052] Embodiment 1.

[0053] <<Whole Constitution>>

[0054]FIG. 2 is a plan view showing one embodiment of a liquid crystaldisplay device according to the present invention, wherein a portionthereof is shown in a form of an equivalent circuit.

[0055] In the drawing, there are provided a pair of transparentsubstrates SUB1, SUB2 which are arranged to face each other with liquidcrystal sandwiched therebetween, wherein the liquid crystal is sealed bya sealing material SL which also performs a function of fixing anothertransparent substrate SUB2 to one transparent substrate SUB1.

[0056] On a liquid-crystal-side surface of one transparent substrateSUB1 surrounded by the sealing material SL, gate signal lines GL whichextend in the x direction and are arranged in parallel in the ydirection and drain signal lines DL which extend in the y direction andare arranged in parallel in the x direction are formed. Regionssurrounded by respective gate signal lines GL and respective drainsignal lines DL constitute pixel regions and a mass of these pixelregions in a matrix array constitute a liquid crystal display part AR.

[0057] Further, on respective pixel regions which are arranged inparallel in the x direction, a common counter voltage signal line CLwhich runs in the inside of respective pixel regions is formed. Thiscounter voltage signal line CL constitutes a signal line which is servedfor supplying a voltage which becomes reference with respect to videosignals to counter electrodes CT in each pixel region described later.

[0058] In each pixel region, a thin film transistor TFT which is drivenby scanning signals from one-side gate signal line GL and a pixelelectrode PX to which the video signals from one-side drain signal lineDL are supplied through the thin film transistor TFT are formed.

[0059] The pixel electrode PX generates an electric field between thepixel electrode PX and the counter electrode CT which is connected tothe counter voltage signal line CL and the optical transmissivity of theliquid crystal is controlled in response to the electric field.

[0060] Respective one ends of the gate signal lines GL extend beyond thesealing material SL and extended ends constitute terminals GLT to whichoutput terminals of a scanning signal drive circuit V is connected.Further, to input terminals of the scanning signal drive circuit V,signals from a printed circuit board (not shown in the drawing) which isarranged outside a liquid crystal display panel are inputted.

[0061] The scanning signal drive circuit V is constituted of a pluralityof semiconductor devices, wherein a plurality of gate signal lines GLwhich are arranged adjacent to each other are formed into a group andone semiconductor device is allocated to each group.

[0062] In the same manner, respective one ends of the drain signal linesDL extend beyond the sealing material SL and extended ends constituteterminals DLT to which output terminals of a video signal drive circuitHe is connected. Further, to input terminals of the video signal drivecircuit He, signals from a printed circuit board (not shown in thedrawing) which is arranged outside a liquid crystal panel are inputted.

[0063] The video signal drive circuit He is also constituted of aplurality of semiconductor devices, wherein a plurality of drain signallines DL which are arranged adjacent to each other are formed into agroup and one semiconductor device is allocated to each group.

[0064] Further, the counter voltage signal lines CL have right-side endportions thereof in the drawing commonly connected and a connection lineextends beyond the sealing material SL, and an extended end of theconnection line constitutes a terminal CLT. A voltage which becomes thereference with respect to the video signals is supplied from theterminal CLT. The respective gate signal lines GL are sequentiallyselected one after another in response to the scanning signal lines fromthe scanning signal drive circuit V.

[0065] Further, to respective drain signal lines DL, the video signalsare supplied at the selection timing of the gate signal lines DL fromthe video signal drive circuit He.

[0066] <<Signal Drive Circuit>>

[0067] While FIG. 3 is a plan view of the liquid crystal display devicein the same manner as FIG. 2, this drawing shows the constitution inwhich the scanning signal drive circuit V is constituted of a pluralityof semiconductor devices, and these semiconductor devices are arrangedin parallel in the y direction on the transparent substrate SUB1 and, atthe same time, the video signal drive circuit He is constituted of aplurality of semiconductor devices and these semiconductor devices arearranged in parallel in the x direction on the transparent substrateSUB1.

[0068] Further, the drain signal line DL which is pulled out from theliquid crystal display part AR side is formed in a conversing mannerdirecting to one semiconductor device together with other drain signallines DL which are arranged adjacent to each other and are formed into agroup.

[0069] This is because that a pitch of bumps of the semiconductor deviceto which respective drain signal lines DL are connected is smaller thana pitch of respective drain signals lines DL in the liquid crystaldisplay part AR.

[0070] In the same manner, the gate signal line GL which is pulled outfrom the liquid crystal display part AR side is formed in a conversingmanner directing to one semiconductor device together with other gatesignal lines which are arranged adjacent to each other and are formedinto a group.

[0071] Further, in this embodiment, among the semiconductor deviceswhich constitute the video signal drive circuit He, a data transfersignal line DTL which connects one semiconductor device and anothersemiconductor device which is arranged adjacent to the formersemiconductor device is formed on the transparent substrate SUB1.

[0072] The signals are sequentially supplied to respective semiconductordevices through the data transfer signal line DTL thus avoiding thecumbersomeness of supplying signals independently to respectivesemiconductor devices.

[0073] In the same manner, also with respect to the semiconductordevices which constitute the scanning signal drive circuit V, the datatransfer signal line DTL which connects one semiconductor device andanother semiconductor device which is arranged adjacent to the formersemiconductor device is formed on the transparent substrate SUB1.

[0074] <<Arrangement Relationship Between Drain Signal Lines and DataTransfer Signal Lines>>

[0075]FIG. 1 is a view showing the detail of the arrangementrelationship between the drain signal lines DL and the data transfersignal lines DTL and FIG. 3 is an enlarged view of a portioncorresponding to a rectangular frame A shown in FIG. 3.

[0076] In the drawing, the drain signal line DL (R) group at the rightside in the drawing is directed to the semiconductor device arranged atthe right side in the drawing although not shown in the drawing andhence, they are formed to run having two bent portions, for example.That is, each drain signal line DL which extends from the liquid crystaldisplay part AR side has the direction thereof changed in the directionthat the drain signal lines DL are converged to each other at the firstbent portion and subsequently runs while changing the direction thereofto the bump side to be connected to the semiconductor device directly bythe next bent portion.

[0077] In the same manner, the drain signal line DL (L) group at theleft side in the drawing is also formed such that the group runs whilehaving two bent portions, for example, to direct the drain signal lineDL (L) group to the semiconductor device arranged at the left side inthe drawing although not shown in the drawing.

[0078] Here, in this embodiment, respective bent portions of each drainsignal line are configured to be positioned within a region where thesealing material SL is formed.

[0079] Then, a region in which the drain signal lines DL are not formedis formed between the drain signal line DL (R) group and the drainsignal line DL (L) group which are directed in the different directions,that is, in the right and left directions, while the data transfersignal line DTL group which connects respective semiconductor devicesarranged adjacent to the region are formed such that they wrap aroundthe region.

[0080] The reason that the data transfer signal line DTL group is formedin such a roundabout manner is to reduce a width of the peripheral sideof the transparent substrate SUB1 with respect to respectivesemiconductor devices which constitute the video signal drive circuitHe, for example, so as to narrow a region which is referred to aso-called picture frame.

[0081] Accordingly, only a slight gap is formed between the drain signalline DL which is arranged at the side of the drain signal line DL groupwhich is connected to each semiconductor device as a group and the datatransfer signal line DTL which is arranged at the side of the datatransfer signal line DTL group.

[0082] In this case, the large difference exists between a length ofeach drain signal line DL and a length of each data transfer signal lineDTL. Accordingly, a charge quantity charged to the drain signal line DLgroup due to the static electricity and a charge quantity charged to thedata transfer signal line DTL group due to static electricity differlargely and hence, as shown in FIG. 4 which corresponds to FIG. 1, aspark SP occurs due to static electricity between the drain signal lineDL and the data transfer signal line DTL which are arranged to adjacentto each other so that either one of the signal lines is disconnected.

[0083] Accordingly, in this embodiment, as shown in FIG. 1, in theabove-mentioned gap, a so-called dummy line DLY is formed along therunning direction of the drain signal line DL which is arranged at theside of the drain signal line DL group, for example. Here, the dummyline DLY implies a line which does not contribute to the signaltransfer. In this embodiment, both ends of the dummy line DLY are notconnected to any other lines.

[0084] Due to such a constitution, a spark can be generated between thedrain signal line DL which is arranged at the side of the drain signalline DL group and the dummy line DLY which is arranged adjacent to thedrain signal line DL and hence, the disconnection of the drain signalline DL can be prevented.

[0085] Further, a spark can be generated between the data transfersignal line DTL which is arranged at the side of the data transfersignal line DTL group and the dummy line DLY which is arranged adjacentto the data transfer signal line DTL and hence, the disconnection of thedata transfer signal line DTL can be prevented.

[0086] Here, in applying the present invention to an actual product, theconstitution which corresponds to FIG. 1 is shown in FIG. 5, and theconstitution which corresponds to the constitution shown in FIG. 5 andis not provided with the dummy line DLY is shown in FIG. 6.

[0087] Embodiment 2.

[0088]FIG. 7 is a view showing another embodiment of the image displaydevice according to the present invention and corresponds to FIG. 1.

[0089] The constitution which makes this embodiment different from theconstitution shown in FIG. 1 lies in that the dummy line DLY has aportion thereof electrically connected to the neighboring drain signalline DL through a connecting portion JK.

[0090] Due to such a constitution, the potential of the dummy line DLYcan be set equal to the potential of the drain signal line DL which ispositioned at the side of the drain signal line DL group and hence, thepotential of the dummy line DLY can be made stable.

[0091] Accordingly, a spark attributed to static electricity can besurely generated at the dummy line DLY.

[0092] In this case, a line width of the drain signal line DL isgenerally set smaller than a line width of the data transfer signal lineDTL.

[0093] Further, it is preferable that a line width of the dummy line DLYis set to a value which is ¾ to {fraction (5/4)} of the line width ofthe drain signal line DL.

[0094] This provision is made to make the capacitance of the drainsignal line DL which is electrically connected to the dummy line DLYapproximate the capacitance of other drain signal line DL. Due to such aconstitution, the luminance can be made uniform. Embodiment 3.

[0095]FIG. 8 is a view showing another embodiment of the image displaydevice according to the present invention and corresponds to FIG. 7.

[0096] In the same manner as the embodiment shown in FIG. 7, althoughthe dummy line DLY is connected to the drain signal line DL which isarranged adjacent to the dummy line DLY, the connecting portion JK isprovided to an end portion at the liquid crystal display part AR sideand is not provided at the peripheral side of the transparent substrateSUB1.

[0097] Due to such a constitution, the disconnection of the dummy lineDLY by sparking occurs at a position close to the liquid crystal displaypart AR. Assuming that the disconnection of the dummy line DLY occurs atthe peripheral side of the transparent substrate SUB1, there existspossibility that the so-called electrolytic corrosion is generated atthe disconnected portion and the electrolytic corrosion progresses fromthe disconnected portion.

[0098] Further, a side of the dummy line DLY which is close to theliquid crystal display part AR is covered with the sealing material SLthus ensuring a state in which the electrolytic corrosion is hardlygenerated from the side even when the disconnection is generated.

[0099] Embodiment 4.

[0100]FIG. 9 is a view showing another embodiment of the image displaydevice according to the present invention and corresponds to FIG. 8.

[0101] The constitution which makes this embodiment different from theembodiment shown in FIG. 8 lies in that when the dummy line DLY shown inFIG. 8 is used as a first dummy line DLY1, a second dummy line DLY2 isprovided adjacent to the first dummy line DLY 1.

[0102] Further, the second dummy line DLY2 is connected to the firstdummy line DLY1 at an end portion of the liquid crystal display part ARside.

[0103] Due to such a constitution, the function of the dummy line DLY isfurther strengthened.

[0104] Embodiment 5.

[0105]FIG. 10 is a view showing another embodiment of the image displaydevice according to the present invention and corresponds to FIG. 9.

[0106] The constitution which makes this embodiment different from theembodiment shown in FIG. 9 lies in that the connection of the seconddummy line DLY2 with the first dummy line DLY1 is not made at the endportion side of the liquid crystal display part AR side but is made atone end of the peripheral side of the transparent substrate SUB1.

[0107] Due to such a constitution, even when the disconnection isgenerated at the second dummy line DLY2 by sparking, the electrolyticcorrosion which is generated at such a portion must go through the firstdummy line DLY1 to reach the drain signal line DL and hence, thepropagation of the electrolytic corrosion becomes difficultstructurally.

[0108] Embodiment 6.

[0109]FIG. 11 is a view showing another embodiment of the image displaydevice according to the present invention and corresponds to FIG. 1.

[0110] The constitution which makes this embodiment different from theembodiment shown in FIG. 1 lies in that between respective semiconductordevices which constitute the video signal drive circuit He, there existsome portions where the above-mentioned data transfer signal line DTL isnot arranged and the counter voltage signal line CL is arranged instead.

[0111] In this embodiment, the portion where the counter voltage signalline CL is arranged is shown. The counter voltage signal line CL isformed as a layer equal to the drain signal line DL, for example, and isformed as a layer (an upper layer) different from the counter electrodeCL which extends to the liquid crystal display part AR side by way of aninsulation film.

[0112] Accordingly, the counter voltage signal line CL is electricallyconnected to the counter voltage CL through a contact hole CH formed inthe insulation film. Here, since the drain signal line DL group isarranged around the counter voltage signal line CL, the above-mentioneddrawback arises due to the difference in the charge quantity of staticelectricity between them. Accordingly, also in this embodiment, thedummy line DLY is provided between the counter voltage signal line CLand the drain signal line DL group.

[0113] It is needless to say that the technical concept described in theabove-mentioned embodiments is also applicable to the specificconstitution of the dummy line DLY in this embodiment.

[0114] The above-mentioned respective embodiments describe theconstitutions which prevent the disconnection or the like attributed tothe spark generated between the drain signal line DL and the datatransfer signal line DTL which connects respective semiconductor devicesof the video signal drive circuit He. However, it is needless to saythat the disconnection or the like due to a spark generated between thegate signal line GL and the data transfer signal line which connectsrespective semiconductor devices of the scanning signal drive circuit Vcan be prevented by the constitution similar to the above-mentionedconstitution.

[0115] Further, although the above-mentioned image display devices havebeen explained by taking the liquid crystal display devices as examples,the present invention is applicable to so-called organic EL displaydevices, for example. This is because that the organic EL display deviceincludes a pair of electrodes through an organic EL layer in theconstitution of the pixel and has substantially the same constitution asthe liquid crystal display device with respect to other constitutions.

[0116] As has been explained heretofore, according to the image displaydevice of the present invention, when one signal line group and anothersignal line group which differs in length from one signal line group arearranged close to each other, the disconnection due to the staticelectricity caused by the spark generated between the signal line of onesignal line group and the signal line of another signal line group whichare arranged adjacent to each other can be prevented.

What is claimed is:
 1. An image display device being characterized inthat a first signal line group constituted of a plurality of firstsignal lines which are arranged in parallel and a second signal linegroup constituted of a plurality of second signal lines which arearranged in parallel in a region adjacent to the group of first signallines are formed on a substrate, and a dummy line is arranged betweenthe first signal line group and the second signal line group.
 2. Theimage display device according to claim 1, wherein both ends of thedummy line are not connected to other signal lines.
 3. The image displaydevice according to claim 1, wherein the dummy line has each one portionthereof connected to the first signal lines or the second signal linewhich is arranged adjacent to the dummy line.
 4. The image displaydevice according to any one of claims 1 to 3, wherein the dummy line isconstituted of a plurality of lines which are arranged in parallel. 5.An image display device being characterized in that a drive circuitwhich supplies signals to respective pixels in an image display part ofa substrate through signal lines is formed outside the image displaypart, the drive circuit is constituted of a plurality of semiconductordevices, and the respective semiconductor devices are configured suchthat data are supplied between these respective semiconductor devicesand other semiconductor devices which are arranged adjacent to theserespective semiconductor devices through data transfer signal lines, anda dummy line is formed between the signal lines and the data transfersignal lines.
 6. The image display device according to claim 5, whereinthe signal lines are drain signal lines which supply video signals torespective pixels, and the drive circuit constitutes a video signaldrive circuit.
 7. The image display device according to claim 5, whereinthe signal lines are gate signal lines which supply scanning signals torespective pixels, and the drive circuit constitutes a scanning signaldrive circuit.
 8. The image display device according to claim 5, whereinthe signal lines which are arranged adjacent to each other are formedinto a group, the signal lines which are formed into each group aredirected in the converging direction outside the image display part andare connected to the respective semiconductor devices, and data transfersignal lines which connect between the semiconductor device and anothersemiconductor device arranged adjacent to the former semiconductordevice are formed such that the data transfer signal lines wrap aroundat the image display part side than these respective semiconductordevices.
 9. The image display device according to claim 5, wherein thedummy lines are connected with the signal lines which are arrangedadjacent to the dummy lines.
 10. The image display device according toclaim 9, wherein the connection between the dummy lines and the signallines are established at the image display part side.
 11. An imagedisplay device being characterized in that a pair of electrodes areformed on each pixel within an image display part of a substrate, one ofthe pair of electrodes includes a counter electrode to which a countervoltage supply signal which becomes the reference with respect tosignals supplied to another electrode of the pair of electrodes issupplied, a drive circuit which supplies signals to the respectivepixels through signal lines is formed outside the pixel display part,the drive circuit is constituted of a plurality of semiconductordevices, a counter voltage supply signal line which supplies countervoltage supply signals to the counter electrode is formed on a regionbetween the semiconductor device and another semiconductor device whichis arranged adjacent to the former semiconductor device, and a dummyline is arranged between the signal lines and the counter voltage supplysignal line.